Seahorse safe reef

Predator tank with some coral

Large reef with a good mixture of fish and ciral.

I am upgrading my tank, and am torn. I either want to get a bigger tank to do a more advanced reef, a large predator tank with few corals, or a tall tank with a few seahorse pairs and seahorse safe coral. What should I do?

I currently have a 55 gal long mixed reef, I am able to redistribute corals and fish to my other tanks if necessary.
Thanks all!